public class ceshi {
    public static void main(String[] args) {
     Student.setClassRoom("金燕龙110教室");
        Student s1 = new Student();
        s1.setName("狗狗");
        s1.setId(001);
        Student s2 = new Student();
        s2.setName("龙龙");
        s2.setId(002);

        System.out.println(s2+s2.getClassRoom());

        System.out.println(s1+s1.getClassRoom());
    Student.setClassRoom("金燕龙111教室");
        System.out.println(s2+s2.getClassRoom());

        System.out.println(s1+s1.getClassRoom());

    }
}
